History in GWT (Please help)

[Sanket L Shah]

Hi All,

I'm developing one application using GWT.
I am facing problem in handling Browser Back and Forward button....

Please help me...

here I am putting some line of code...

This is my entrypoint class...

public class NextPre implements EntryPoint {
	public void onModuleLoad() 
	{
		History.addHistoryListener(new MyHistoryListener());
		com.gwtext.client.widgets.Button nextButton = new com.gwtext.client.widgets.Button("Next", new nextButtonListener());
		com.gwtext.client.widgets.Button preButton = new com.gwtext.client.widgets.Button("Previous", new preButtonListener());
		com.gwtext.client.widgets.Button thirdButton = new com.gwtext.client.widgets.Button("ThirdButton", new ThirdButtonListener());
		
		Panel panel = new Panel();
		
		RootPanel.get("previous").add(preButton);
		RootPanel.get("next").add(nextButton);
		RootPanel.get("third").add(thirdButton);
		
		

	}
	
	class nextButtonListener extends ButtonListenerAdapter
	{
		  public void onClick(Button button, EventObject e) 
		  {
			  History.newItem("login");
			  RootPanel.get().clear();
			  RootPanel.get().add(new Panel1());
		  }
	}
	
	class preButtonListener extends ButtonListenerAdapter
	{
		  public void onClick(Button button, EventObject e) 
		  {
			  History.newItem("second");
			  RootPanel.get().clear();
			  RootPanel.get().add(new Panel2());
		  }
	}
	
	class ThirdButtonListener extends ButtonListenerAdapter
	{
		  public void onClick(Button button, EventObject e) 
		  {
			  History.newItem("third");
			  RootPanel.get().clear();
			  RootPanel.get().add(new Panel3());
		  }
	}

}
 

Here is my three panels...

public class Panel1 extends Composite {
	public Panel1() {
		{
			//History.newItem("login");
			Label lblSecondPage = new Label("In the First Panel"); 
			initWidget(lblSecondPage);
		}
	}
}


public class Panel2 extends Composite {
	public Panel2() {
		{
			//History.newItem("login");
			Label lblSecondPage = new Label("In the Second Panel"); 
			initWidget(lblSecondPage);
		}
	}
}

public class Panel3 extends Composite {
	public Panel3() {
		{
			//History.newItem("login");
			Label lblSecondPage = new Label("In the Third Panel"); 
			initWidget(lblSecondPage);
		}
	}
}

Here is my class extending HistoryListener

public class MyHistoryListener implements HistoryListener {

	public MyHistoryListener()
	{
		
	}
	@Override
	public void onHistoryChanged(String historyToken) 
	{
		
		// TODO Auto-generated method stub
       if (historyToken.equals("login"))
       {
    	   RootPanel.get().clear();
    	   RootPanel.get("myDiv").clear();
           RootPanel.get("myDiv").add(new Login());
           System.out.println("Login : " +historyToken);   
       }else  if(historyToken.equals("second"))
       {
    	   RootPanel.get().clear();
    	   RootPanel.get("myDiv").clear();
    	   RootPanel.get("myDiv").add(new Second());
    	   System.out.println("Second : " +historyToken);
       } else if (historyToken.equals("third"))
       {
    	   RootPanel.get().clear();
    	   RootPanel.get("myDiv").clear();
    	   RootPanel.get("myDiv").add(new Third());
    	   System.out.println("Third : " +historyToken);
       }
	}

}

Please help me.....
Thanks